<template>
  <view class="viewport">
    <!-- 推荐封面 -->
    <view class="cover">
      <image :src="bannerPicture" />
    </view>
    <!-- tab栏 -->
    <view class="tabs">
      <!-- 5.2 列表渲染 -->
      <text
        :class="{ active: item.id === activeId }"
        @click="activeId = item.id"
        v-for="item in subTypes"
        :key="item.id"
        class="text"
      >
        {{ item.title }}
      </text>
    </view>
    <!-- 列表内容 -->
    <!-- 真正商品列表, 开始就遍历生成了所有分类, 只是没激活就不显示 -->
    <scroll-view
      scroll-y
      class="scroll-view"
      v-for="(item, id) in goodsItems"
      :key="id"
      v-show="id === activeId"
      @scrolltolower="loadMore"
    >
      <view class="goods">
        <navigator
          hover-class="none"
          class="navigator"
          v-for="goods in item.items"
          :key="goods.id"
          :url="`/pages/goods/index?id=${goods.id}`"
        >
          <image class="thumb" :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
          </view>
        </navigator>
      </view>
      <view class="loading" v-if="finished">没有更多多数据了</view>
      <view class="loading" v-else>正在加载...</view>
    </scroll-view>
  </view>
</template>
<script>
import { getRecomendsAPI } from "@/api/home";
const urlMap = {
  1: { title: "特惠推荐", url: "/home/preference/mutli" },
  2: { title: "爆款推荐", url: "/home/inVogue/mutli" },
  3: { title: "一站买全", url: "/home/oneStop/mutli" },
  4: { title: "新鲜好物", url: "/home/new/mutli" }, // 后端未提供，暂用新鲜好物url
  5: { title: "新鲜好物", url: "/home/new/mutli" },
};
export default {
  data() {
    return {
      bannerPicture: "",
      subTypes: [],
      goodsItems: {},
      activeId: "",
    };
  },
  async onLoad({ type }) {
    this.currentItem = urlMap[type];

    uni.setNavigationBarTitle({
      title: this.currentItem.title,
    });
    const { result } = await getRecomendsAPI(this.currentItem.url);
    const { bannerPicture, goodsItems, subTypes } = result;
    this.bannerPicture = bannerPicture;
    this.goodsItems = goodsItems;
    this.subTypes = subTypes;
    // 将第一项id设置为高亮
    this.activeId = this.subTypes[0].id;
    // console.log(type, this.subTypes[0].id);
  },
  methods: {
    async loadMore() {
      // 如果已经是最后一页, 那么需要停止继续加载
      if (this.finished) return;
      // console.log("到底啦!");
      const { result } = await getRecomendsAPI(
        this.currentItem.url,
        this.activeId,
        this.pageInfo.page + 1
      );
      console.log(result);

      // 只取当前激活项的新数据, 进行拼接 (这里 goodsItems 是新数据)
      const { goodsItems } = result;
      const { items, page, pages, pageSize, counts } =
        goodsItems[this.activeId];

      // 将新数据合并和当前列表中 (这里的 this.goodsItems 是旧数据)
      this.goodsItems[this.activeId].items = [
        ...this.goodsItems[this.activeId].items,
        ...items,
      ];
      this.goodsItems[this.activeId].page = page;
      this.goodsItems[this.activeId].pages = pages;
      this.goodsItems[this.activeId].pageSize = pageSize;
      this.goodsItems[this.activeId].counts = counts;
    },
  },
  computed: {
    pageInfo() {
      if (!this.activeId) return {};
      // 由于拿回来的商品列表自带当前页码配置, 不用自己管理, 取出来即可
      const { page, pages } = this.goodsItems[this.activeId];
      return { page, pages };
    },
    finished() {
      if (!this.activeId) return false;
      if (this.pageInfo.page < this.pageInfo.pages) return false;
      return true;
    },
  },
};
</script>

<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}
.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}
.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
}
.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;
  .text {
    margin: 0 20rpx;
    position: relative;
  }
  .active {
    &::after {
      content: "";
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}
.scroll-view {
  flex: 1;
  overflow: hidden;
}
.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;
  .navigator {
    width: 345rpx;
    padding: 20rpx;
    margin-top: 20rpx;
    border-radius: 10rpx;
    background-color: #fff;
  }
  .thumb {
    width: 305rpx;
    height: 305rpx;
  }
  .name {
    height: 88rpx;
    font-size: 26rpx;
  }
  .price {
    line-height: 1;
    color: #cf4444;
    font-size: 30rpx;
  }
}
.goods .symbol,
.goods .decimal {
  font-size: 70%;
}
</style>
